Question

So I’m trying to write a script that uses switch parameters and I also need arguments to go along with them. So for instance,

Function Foo ($X, $Z, [switch]$Y, $Yarg, [switch]$K, $Karg){
  if($Y){
    $Yup = $Yarg
  }

  if($K){
    $Y = $Karg
  }Else{$Y = 42}

  $X + $Z / $Yup

}

Essentialy I want to ask if the switch is there, then if it’s there I want it to use the $Yarg variable, currently when I do that I get an error saying the switch can only be a boolean value. Then the rest of the code fails. Any ideas?

Answer 1

My assumption is that Y and K are mutually exclusive parameter sets, and X and Z are common to both, and mandatory. If neither -Y nor -K are specified, the default will be -Y. I’m using the alternate parameter declaration syntax here for clarity:

function Foo(
    [cmdletbinding(defaultparametersetname="setY")]
    param(
        [parameter(mandatory=$true)]
        $X,

        [parameter(mandatory=$true)]
        $Y

        [parameter(parametersetname="setY")]
        [switch]$Y,

        [parameter(parametersetname="setY", mandatory=$true)]
        $YArg,

        [parameter(parametersetname="setK")]
        [switch]$K,

        [parameter(parametersetname="setK", mandatory=$true)]
        $KArg,
    )
    # do work
)

I’m hoping the syntax should be obvious.